/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.cmd;

import java.io.Serializable;
import java.util.Collection;
import java.util.Map;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.TaskEntity;
import org.activiti.engine.task.Task;


/**
 * @author Tom Baeyens
 * @author Joram Barrez
 */
public class GetTaskVariablesCmd implements Command<Map<String, Object>>, Serializable {

  private static final long serialVersionUID = 1L;
  protected String taskId;
  protected Collection<String> variableNames;
  protected boolean isLocal;

  public GetTaskVariablesCmd(String taskId, Collection<String> variableNames, boolean isLocal) {
    this.taskId = taskId;
    this.variableNames = variableNames;
    this.isLocal = isLocal;
  }

  public Map<String, Object> execute(CommandContext commandContext) {
    if(taskId == null) {
      throw new ActivitiIllegalArgumentException("taskId is null");
    }
    
    TaskEntity task = commandContext
      .getTaskEntityManager()
      .findTaskById(taskId);
    
    if (task==null) {
      throw new ActivitiObjectNotFoundException("task "+taskId+" doesn't exist", Task.class);
    }

    
    if (variableNames == null) {
    	
    	if (isLocal) {
    		return task.getVariablesLocal();
    	} else {
    		return task.getVariables();
    	}
    	
    } else {
    	
    	if (isLocal) {
    		return task.getVariablesLocal(variableNames, false);
    	} else {
    		return task.getVariables(variableNames, false);
    	}
    	
    }
    
  }
}
